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DNA 7
Algebra 1
9-3 Solving Quadratic Equations
by Completing the Square
Standard 14.0
Students solve a quadratic equation by…
completing the square
x  6x  c
2
x2
x
1
c9
x  6x  9
2
x2
x
x
x
x
1
1
1
x
1
1
1
x
1
1
1
x  6x  c
2
1 
c   b
2 
2
1

c   (6) 
2

2
c  3
2
c9
Ch. 9-3
Classwork
Name
Date
Algebra 1
Period
Classwork
Page 489:
Time Left:
# 16 & 17
a 2  14a  49  36
1. Get rid of “c”
2. Create a new “c” by
Completing the
Square
3. Add “c” to both
sides
4. Factor Trinomial
5. Take the Square
Root of both sides
6. Solve for the
variable
a 2  14a  49  36
x2  6x  7  0
1. Get rid of “c”
2. Create a new “c” by
Completing the
Square
3. Add “c” to both
sides
4. Factor Trinomial
5. Take the Square
Root of both sides
6. Solve for the
variable
1. Get rid of “c”
2. Create a new “c” by
Completing the
Square
3. Add “c” to both
sides
4. Factor Trinomial
5. Take the Square
Root of both sides
6. Solve for the
variable
Classwork
Page 489:
Time Left:
# 20 & 25
Classwork
Page 489:
Time Left:
# 26 & 27
Classwork
Page 492:
Time Left:
# 9, 10, & 11
Homework
Page 489:
# 5, 7, & 8